chore: added build instructions

BUILD.md

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+# Building on Linux
+
+For pre-requisite packages, check [deps.txt](./deps.txt)
+
+If your distribution does not provide ReactPhysics3D, you will have to build (and install) it yourself prior to this step
+
+Use the following to generate the build files:
+
+    cmake -Bbuild .
+
+Then build the project using:
+
+    cmake --build build
+
+# Building on Windows
+
+The project will be built using VCPKG and MSVC
+
+## Pre-requisites
+
+* Visual Studio 17.13.3 or higher, with MSVC v143/14.42.34438.0 or higher
+* Qt 6.8.3 or higher, with MSVC toolchain
+* CMake
+* Git (for cloning the repo, optional)
+* ReactPhysics3D prebuilt library
+
+You will have to build and install ReactPhysics3D yourself. Check the [build instructions on ReactPhysics3D](https://www.reactphysics3d.com/documentation/index.html#building) for help
+
+To start, clone the repository:
+
+    git clone https://git.maelstrom.dev/maelstrom/openblocks
+
+Then, launch the *x64 Native Tools Command Prompt for VS 2022*, and cd into the directory that you cloned the project into
+
+Once in the directory, add Qt to the `CMAKE_PREFIX_PATH` variable (for instance, if you install Qt to `C:\Qt\6.8.3`):
+
+    set CMAKE_PREFIX_PATH=C:\Qt\6.8.3\msvc2022_64
+
+Now, generate the build files with cmake via the vcpkg preset:
+
+    cmake -Bbuild . --preset vcpkg
+
+Then, finally, build in release mode:
+
+    cmake --build build --config Release
+
+The compiled binaries should then be placed in `./build/bin/` and should be ready for redistribution without any further work.
+
+If any of the compilation steps fail, or the binaries fail to execute, please create an issue so that this can be corrected.

README.md

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+# Openblocks
+
+[ Docs are work in progress! ]
+
+For build instructions, see [BUILD.md](./BUILD.md)